Abstract Singular limits for the following indirect signalling chemotaxis system aligned \ array{lllllll ₜ n = n - (n c) & in (0, ), \\ ₜ c = c - c + w & in (0, ), \\ ₜ w = w - w + n & in (0, ), \\ _ n = _ c = _ w = 0, & on (0, ) array. aligned ∂ t n = Δ n - ∇ · (n ∇ c) in Ω × (0, ∞), ε ∂ t c = Δ c - c + w in Ω × (0, ∞), ε ∂ t w = τ Δ w - w + n in Ω × (0, ∞), ∂ ν n = ∂ ν c = ∂ ν w = 0, on ∂ Ω × (0, <mml: m
Bui et al. (2026) studied this question.